氧化物添加剂对Ag-SnO_(2)电接触材料抗蠕变性能的影响

Effect of Oxide Additives on the Creep Resistance of Ag-SnO_(2) Electrical Contact Materials

为研究氧化物添加剂对Ag基电接触材料抗蠕变性能的影响,用粉末冶金法制备了分别含有CuO、WO_(3)和In_(2)O_(3)的Ag-SnO_(2)材料。室温下对拉伸试样进行蠕变实验,获得蠕变特征曲线及相关参数,构建了Ag-SnO_(2)材料的蠕变本构方程。借助扫描电子显微镜(SEM)对拉伸断口形貌进行分析,用ABAQUS有限元软件进一步对蠕变行为进行模拟。结果表明:由于SnO_(2)与Ag基体间的界面强度得到提高,氧化物添加剂可显著增强Ag-SnO_(2)电接触材料的抗蠕变性能,尤其是CuO添加剂的效果最佳。模拟结果与通过实验获得的蠕变数据基本吻合,误差小于3%。研究结果对预测Ag基电接触材料的蠕变行为及改善力学性能均具有一定参考价值。

To investigate the effect of oxide additives on the creep resistance of Ag based electrical contact materials, Ag-SnO_(2) contact materials with CuO, WO_(3) and In_(2)O_(3) were prepared by powder metallurgy. The creep tests were performed on the tensile specimen at room temperature, and the creep characteristic curves and related parameters were obtained. The creep constitutive equation of the Ag-SnO_(2) contact materials was constructed. The fracture morphology was analyzed by scanning electron microscope(SEM). The creep behavior was further simulated by ABAQUS finite element software. The results show that the oxide additives can significantly enhance the creep resistance of the Ag-SnO_(2) electrical contact materials due to the improvement of interfacial strength between SnO_(2) and Ag matrix, especially CuO additive has the best effect. It is shown that the simulation results are basically consistent with the experimental data and the error is less than 3%. The obtained results are of great reference value for predicting the creep behavior of Ag-based contact material and improving the mechanical properties.